Bill, i looked in my service manual also and couldn't find any info on the removal or repair of the actuator. But i did go through my warranty invoices and found the repair that the tech did to my xfire, they said they found the actuator and linkage broken, they replaced the actuator and linkage, and the door housing. Unfortunately they did pull the ac evaporator and heater core, i would guess to gain access to the actuator and linkage. Also here are the pt #s that they used.

They listed 2 different pt #s on the invoice.

actuator 5099765-AA or 24029001
clip 5127433-AA or 24030013
housing 5098304-AA or 24028025

And after looking at those pictures it looks like the door is returned with the spring and pulled in with the arm coming from the what looks to be a diaphragm housing, which is controlled from the vacuum actuator. I think?